MAPLETON – The beach at Conestogo Lake Conservation Area is closed for the rest of the season following a blue-green algae bloom and reduced water levels.
The closure comes as the summer winds down and water levels in the reservoir are reduced for dam repairs.
“The decision to close the beach in this case is due to the combination of the suspected blue-green algae bloom impacting the beach and swimming area, as well as the anticipated further reduction in water levels, which will result in the closure of both boat launches,” the Grand River Conservation Authority (GRCA) said in an Aug. 22 press release.
The “West” (shorter) boat launch is closed as of Aug. 23, and following Labour Day, the lake’s second boat launch will also be closed.
The decision to immediately close the beach was made at Wellington Dufferin Guelph Public Health’s recommendation. Beach closures at its conservation areas are rare, the GRCA said.
GRCA water quality supervisor Cameron Irvine said algae blooms are affected by heat, wind, and water flow and levels.
“Low water levels in the reservoir, [combined] with warm air temperatures create the perfect conditions for algae to grow and bloom in large bodies of water,” Irvine said.
A bloom was first noticed on the lake Aug. 11. A small bloom was also seen in July at Belwood Lake, where an advisory remains in effect.
Some varieties of blue-green algae can be harmful to animals and humans. A bloom starts with a green or brown scum on surface water, smelling like fresh-cut grass. The water appears green or like blue-green pea soup.
A full bloom can appear like spilled paint and smell like rotting garbage.
Such blooms often occur at Belwood, Conestogo, and Guelph Lakes; Woolwich reservoirs; and Snyder’s Flats, according to the GRCA.
Permanent signage is posted at those locations advising visitors of the potential for blooms and recommended precautions.
The GRCA said Conestogo Lake is not fit for swimming. Boating is still permitted.
The GRCA recommends:
- keeping children and pets away;
- avoiding contact with algae;
- no eating or fishing from from the lake; and
- not drinking the water or using it at all.
